Pop-type-pressure and vacuum-gas-relief valve for tanks



p Patented Mar. 1-7, l1925.

UNITEDsTATEs P *TENT OFFICE,

CHARLES F. TUTTLE, OF RICHMOND, CALIFORNIA, ASSIGNR TO STANDARD-.OIL C OM- PANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION F CALIFORNIA.

POP-TYPE-PRESSURE AND VACUUIN-GrAS-RELIEI` VALVE FOR'TANXS.

Application led November 1B, 1924. Serial N o. 750,543.

To all 'whfim it may concern:

Be it known that I, ACHARLES F. TUT'ILE,

' a citizen of the United States, resiidiner at Richmond, in the county of Contra (festa and State of California, have invented a new and useful lop-'lype-Pressure and Vacuum? Gas-Relief Valve for Tanks, of which the following is a specification.

This invention relates to a valve for. use upon oil` tanks or gas gathering lines from tanks. v

An object of this invention is to provide a valve -with a positive acting combination pressure and vacuum releasing means which is liquid sealed and so designed and'arranged that possibility' of the different parts sticking or failing to operate from other causes,

"such as the' corrosive action of the gases handled, is substantially eliminated.

Another object of-theinvention is to provide a positively acting combination pres- Isure and vacuum gas reliefyalve which will positively beanaintained closed against leakageol' gas through the valve until the opening pressures of the pressure or vacuum valve are exceeded and which will close posilivel y as soon as the pressure drops below a `preiIetermined amount. Another object ofthe invention is to provide a valve so constructed that blowing out ol' the liquid seal in the valve is prevented duringr operation.

Various other objects and advantages of ibe invention will appear trom the following desi-ri ption of a preferred form of the invention as shown in the accompanying drawings.

lu the drawings: i

Fig. 1 is an elevation in vertical section of such combined pop type pressure and vacuum relief valves. l

Fig. 2 is a transverse section on the line 2-2 of Fig. 1.

Referring to the drawings, the valvecomprises a connecting T 1 by which the valve may be connected to a tank or line served by the valve. The connecting T 1 also serves to support the pressure and vacuum valve assemblies.

The valve comprises a vacuum releasing device 2 and a pressure releasing'device 3, which devices are substantially identical in construction. The pressure releasing device is' indicated as above the T 1 and the vacuum releasing device as below the T 1. Each assembly comprises a valve body 4 of suitable material such as cast iron. bodies have 'lower Vvertical cylindrical ex` tensions 5 connected at their lower end to vertical vsleeves G within the extensions 5, the extensions 5 and the sleeves 6 thus forming annular oil seal wells 10. The 'b0die`s4 lare enlarged above the extensions 5, as indicated at 7, andthe upper ends of the bodiles are connected to vertical tubular blow'E down chambers 8 preferabl of cast aluminum, such chambers being lie bolts 5) extending through corresponding flanges 11 and 11a on the bodies 4 and blow down chambers 8. A

The blow down chamber 8 of the vacuum releasing device 2 is connected to the @lower end of the T y1 and the chamber 8 eixtends within the T as shown in Fig. 1. Each of the vdevices 2 and 3 comprise seamless lbells 12 preferably of pressed aluminungsuch` bells'being provide( with skirts 1.3, the lower i The valve Id to the bodies by -i ends ol. which terminate slightly above the low-fer edges of the bells-i12. The bells 12 are i connected to tubular valve stems 14 preferably of aluminum. such tubular valve stems extending vertically above the valves and are provided at ytheir upper ends with blow down discs 15 also preferably of aluminum. The valve bellsfl2, discs 15 and tubular valve stems 14 are guided centrally by valve guides 16 depending throughthe blow down chambers 8 from yokes 17 atfthe upper ends of `the blow down chambers, the guide rods 1G being preferably et' aluminum and the voices 17 being preferably integral with the blow down 'chambers 8. The guide rods 16 are held securely' to the yokes 17 by plugs 184 of wood or other suitable material.

'lhe sealing oil level within the oil seal wells 10'may be inspected and maintained through connections 19 and the wells may be cleansed out through drain connec- -tions 20.

maintaining, the vacuum release device closed. usually placed on the top of the pressure release bell 12.

5 In operation, both of the valves are normally intheir closed position. For example, when the pressure in the tank or line connected with'the T 1 rises, such pressure acts through the tube 6 of the pressure x0 release device to depress the oil between the bell 12 and tube `6 of such device until the i pressureiacting on the area ofthe bell. is sufficient to balance the weight of the `bell, skirt, stem and disc. The bell then rises 15 until its bottom edge comes to the surface ot' the sealing oil between the bell and tube t Gas or vapor admitted through the T 1 then is permitted to bubble into the space beftween'thebell k12A and its skirt 1?'.

'l skirt and cylinder extension 5 or' the body v2 is thenlequal to the so-called pop pressure i Ahead.above the bottom of the belland thereby ,forms ofthe skirt a piston with an oil seal'between it' and the walls of the oil seal rWell 10,@l The gas bubbling under the edge i `of the bell and into the skirt 13 applies the so-called pop pressure to, the total Varea u ylibe bell and skirt givinga resultant upwa1' l force materially in excess of the 'weight of f the bellj'skirt, stem and disc,'thereby causing such partsto' pop to the wide open posi-` .,tion `Inc-suchgposition, the gas or vapor passesfaround the bell and'ski'rtl and escapes through the enlargement 7 of the body throughthe space vlbetween the blow down ,f chamber and blow down disc 15 into the at- 'mosphere` j y The gas is ireleased at 'constant' pressures 4o for ,quantities within the capacity of the valve, the height of the blow down disc l5 above the`top .of the blow down chamber varying with the` quantity to be rreleased until this quant'itv can just be handled by the clearance between the blow down disc and chamber walls. The disc 15 and bbll l2 then slowly settle down until the bell'12 touches 'the surface of oil within the ilwell seal 10. T hisfcauses a reduction vof pressure un der the disc and as the blow dciwn pressure acting only'on the area of the bell will not support the weight of the bell l2, skirt 13, .stem 144 and disc 15, the bell l2 will settle' in the oil. seal well 10 and close completely, the

V -gas between the bell and skirt escapirug;l through a few small ventsf'la disposed nr the upper part ol the skirt 13. v

The vacuum vulve acts similarly when the pressure inthe tank or lineiconnectcd with 60.-tlie T.J1 is reducedujlciently below atmos- For this purpose, weights 23 arel The p lac height of the oil sealA surface between the 'day of October 1924.

pneric to producethe pressure differential, at which the vacuum release device 2 pops.

Loss of sealing oil from the device is prevented-by the provision of large gas passages around the bells 12 and skirts 13. Any oil adhering to these parts when the device pops will bev blown against the valve body Walls by gas moving at relatively low veloc` ities and thus not be carried out of the valve.

The possibility of sticking of the valve caused by corrosive, gases is practically eliminated by making of aluminum all moving parts which come Iin/contact with other parts. f

The invention is ofl the scope setforth in the `appended claims.

1. A device of the class'l described comprising a 1T, pressure releaseV and vacuum' release devices connected -to the T, such devices each including an oil well seal, a bell carrying a skirtnnovable into the seal, a stem connected to the bell and carrying; a blow down disc, and ablew down chamber 'withifn which-the discreciprocates, the pres- Vsure release device being connected to the T so as to apply pressuretherein against the bell4 andthe vacuum release .device being connected lto the T so .that the pressurefof the atmosphereisfapplied tothe valve.

2. A device of the classdescribed,- comi' pris-ing an oil well seal, a bell carrying a skirt movable into the seal, a"stem connected to lthe hell and carrying a blow down disc, and a blow down chamber within which the disc reciprocates. i' f v A device ofthe class described, com

prising an annular oil Well seal, afbell carryy ing a skirt movable into the seal, means for directing fluid pressure onto said bell, 'a stem connected tothe bell .andcarrying a blow down disc, and a chamber operative to rapidly blow down said disc in closingthe `device.

4. In a device` adapted to jerk or pop open and close as theV difference-between the external and internal pressure of a line ii-tank- Signed at Richmond,.California this 31st CHARLES F. Turrini lll) 

